ML20085F950

AO 75-013:on 750619,plant Discharge Water Temp & Heat Rate Exceeded Tech Spec Limits.Caused by Changing Lower Basin Level.Addl Operating Procedures to Be Formulated for Raising & Lowering Cooling Tower Basin Levels

ML20085F950
Person / Time
Site:	Palisades
Issue date:	06/30/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20085F925	List: ML20085F924 ML20085F927 ML20085F941 ML20085F950 ML20085F960
References
A-75-13, A0-75-013, NUDOCS 8308230674
Download: ML20085F950 (2)

Text

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/r il CORSum8IS O W%T:::7w Company Power

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S 3(([7 J ] c,ener.i o,,ece. , Cl2 WeM Meu egen AveL,e'hc h mon, Mer ti gen 49701. Area Code SU . HH-05*>O j' l \

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\l Division of Reactor Licensing Re: Docket 50-255 US Huclear Regulatory Commission License DPR-20 Washington, DC 20555 Palisades Plant A0-75-13 Gentlemen:

/ Attached is Abnorme.1 Occurrence Report A0-75-13 which ec, vers the Spe[releaseofheatedwaterataratewhichexceededtheTechnicalcifications limits.) There were with this occurrence.

Yours very truly, Ralph B. Sewell (Signed)

DAB /mel Ralph B. Sewell Nuclear Licensing Administrator l CC: JGKeppler, USNRC l l

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O 8308230674 750708 PDR ADOCK 05000255 S PDR I

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I O ABNORMAL OCCURRENCE REPORT i

Palisades Plant

1. Report Number: A0-75-13, Docket 50-255,

2. a. Report Date: June 30, 1975

b. Occurrence Date: June 19,1975 1

3 Facility: Pslisades Nuclear Plant, Covert, MI.

4. Identification of Occurrence: Plant discharge water temperature (5*F increase) and heat rate (0.5 billicn Btu per hour) above Technical Specifications >

limits.

5 Conditions Prior to Occurrence: Steady state power operation at 80%.

6. Description of Occurrence: On June 19, 1975 at about 1715 the temperature in the plant mixing basin increased from 66.5 F to about 86 F. For the next 1-1/2 hours the temperature fluctuated between 76*F and 86'F. At about 1845 the temperature went back up to 85*F and remained there until about 0545 on June 20, 1975 It reduced to 80 F until about 0800, then fluctuated slightly downward. At 0930 it was down to 70 F. The temperature of the inlet water vaa 65-66 F during this period.

7. Designation of Apparent Cause: Inspection of the charts and log sheets indicates that the lower basin level was being changed during the period of this occurrence. There presently are no existing procedures which de-fine the proper method for raising and lowering tower basin levels during operation. Dilution water was being pumped into the circulating system and the flow over the weir was excessive due to the additional makeup.

8. Analysis of Occurrence: No infringement was made to the safety of the public as a result of this incident. The maximum release rate of thermal discharge was 0.6 x 109 Btu /h which is above the Technical Specifications 31mit of 0 50 x 109 Btu /h.

9 Corrective Action: Appropriate additional operating procedures will be formulated for raising and lowering cooling tower basin levels during operation. These procedures are expected to be completed by July 11, 1975

10. Failure Data: Not applicable.

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